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remoteproc: Introduce function rproc_detach()

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Introduce function rproc_detach() to enable the remoteproc
core to release the resources associated with a remote processor
without stopping its operation.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Link: https://lore.kernel.org/r/20210312162453.1234145-11-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Mathieu Poirier 2021-03-12 09:24:46 -07:00 committed by Bjorn Andersson
parent 6070203fe4
commit d3962a3978
2 changed files with 58 additions and 1 deletions
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58
drivers/remoteproc/remoteproc_core.c
View File

@ -1715,7 +1715,7 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
/*
* __rproc_detach(): Does the opposite of __rproc_attach()
*/
static int __maybe_unused __rproc_detach(struct rproc *rproc)
static int __rproc_detach(struct rproc *rproc)
{
struct device *dev = &rproc->dev;
int ret;
@ -1954,6 +1954,62 @@ out:
}
EXPORT_SYMBOL(rproc_shutdown);
/**
* rproc_detach() - Detach the remote processor from the
* remoteproc core
*
* @rproc: the remote processor
*
* Detach a remote processor (previously attached to with rproc_attach()).
*
* In case @rproc is still being used by an additional user(s), then
* this function will just decrement the power refcount and exit,
* without disconnecting the device.
*
* Function rproc_detach() calls __rproc_detach() in order to let a remote
* processor know that services provided by the application processor are
* no longer available. From there it should be possible to remove the
* platform driver and even power cycle the application processor (if the HW
* supports it) without needing to switch off the remote processor.
*/
int rproc_detach(struct rproc *rproc)
{
struct device *dev = &rproc->dev;
int ret;
ret = mutex_lock_interruptible(&rproc->lock);
if (ret) {
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
return ret;
}
/* if the remote proc is still needed, bail out */
if (!atomic_dec_and_test(&rproc->power)) {
ret = 0;
goto out;
}
ret = __rproc_detach(rproc);
if (ret) {
atomic_inc(&rproc->power);
goto out;
}
/* clean up all acquired resources */
rproc_resource_cleanup(rproc);
/* release HW resources if needed */
rproc_unprepare_device(rproc);
rproc_disable_iommu(rproc);
rproc->table_ptr = NULL;
out:
mutex_unlock(&rproc->lock);
return ret;
}
EXPORT_SYMBOL(rproc_detach);
/**
* rproc_get_by_phandle() - find a remote processor by phandle
* @phandle: phandle to the rproc

1
include/linux/remoteproc.h
View File

@ -664,6 +664,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len,
int rproc_boot(struct rproc *rproc);
void rproc_shutdown(struct rproc *rproc);
int rproc_detach(struct rproc *rproc);
int rproc_set_firmware(struct rproc *rproc, const char *fw_name);
void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
void rproc_coredump_using_sections(struct rproc *rproc);